(See CALL FOR RELEASE.)
NATIONAL AIRSPACE SYSTEM
The common network of U.S. airspace; air navigation facilities, equipment and services, airports or landing areas; aeronautical charts, information and services; rules, regulations and procedures, technical information, and manpower and material. Included are system components shared jointly with the military.
NATIONAL BEACON CODE ALLOCATION PLAN AIRSPACE
Airspace over United States territory located within the North American continent between Canada and Mexico, including adjacent territorial waters outward to about boundaries of oceanic control areas (CTA)/Flight Information Regions (FIR). (See FLIGHT INFORMATION REGION.)
NATIONAL FLIGHT DATA CENTER
A facility in Washington D.C., established by FAA to operate a central aeronautical information service for the collection, validation, and dissemination of aeronautical data in support of the activities of government, industry, and the aviation community. The information is published in the National Flight Data Digest. (See NATIONAL FLIGHT DATA DIGEST.)
NATIONAL FLIGHT DATA DIGEST
A daily (except weekends and Federal holidays) publication of flight information appropriate to aeronautical charts, aeronautical publications, Notices to Airmen, or other media serving the purpose of providing operational flight data essential to safe and efficient aircraft operations.
NATIONAL SEARCH AND RESCUE PLAN
An interagency agreement which provides for the effective utilization of all available facilities in all types of search and rescue missions.
(See NAVIGATIONAL AID.)
VOR, VORTAC, and TACAN aids are classed according to their operational use.
Airspace at and above the minimum flight altitudes prescribed in the CFRs including airspace needed for safe takeoff and landing. (Refer to 14 CFR Part 91.)
Any visual or electronic device airborne or on the surface which provides point-to-point guidance information or position data to aircraft in flight. (See AIR NAVIGATION FACILITY.)
(See NATIONAL BEACON CODE ALLOCATION PLAN AIRSPACE.)
(See NONDIRECTIONAL BEACON.)
“No,” or “permission not granted,” or “that is not correct.”
Used by pilots to inform ATC that: a. Previously issued traffic is not in sight. It may be followed by the pilot’s request for the controller to provide assistance in avoiding the traffic. b. They were unable to contact ATC on a particular frequency.
(See NATIONAL FLIGHT DATA CENTER.)
(See NATIONAL FLIGHT DATA DIGEST.)
The time between the end of evening civil twilight and the beginning of morning civil twilight, as published in the Air Almanac, converted to local time. (See ICAO term NIGHT.)
The hours between the end of evening civil twilight and the beginning of morning civil twilight or such other period between sunset and sunrise as may be specified by the appropriate authority. Note: Civil twilight ends in the evening when the center of the sun’s disk is 6 degrees below the horizon and begins in the morning when the center of the sun’s disk is 6 degrees below the horizon.
NO GYRO APPROACH
A radar approach/vector provided in case of a malfunctioning gyro-compass or directional gyro. Instead of providing the pilot with headings to be flown, the controller observes the radar track and issues control instructions “turn right/left” or “stop turn” as appropriate. (Refer to AIM.)
NO GYRO VECTOR
(See NO GYRO APPROACH.)
NO TRANSGRESSION ZONE (NTZ)
The NTZ is a 2,000 foot wide zone, located equidistant between parallel runway or SOIA final approach courses in which flight is normally not allowed.
NONAPPROACH CONTROL TOWER
Authorizes aircraft to land or takeoff at the airport controlled by the tower or to transit the Class D airspace. The primary function of a nonapproach control tower is the sequencing of aircraft in the traffic pattern and on the landing area. Nonapproach control towers also separate aircraft operating under instrument flight rules clearances from approach controls and centers. They provide ground control services to aircraft, vehicles, personnel, and equipment on the airport movement area.
That segment of a North American Route between the inland navigation facility and a designated North American terminal.
Separation in accordance with minima other than the composite separation minimum specified for the area concerned.
An L/MF or UHF radio beacon transmitting nondirectional signals whereby the pilot of an aircraft equipped with direction finding equipment can determine his/her bearing to or from the radio beacon and “home” on or track to or from the station. When the radio beacon is installed in conjunction with the Instrument Landing System marker, it is normally called a Compass Locator. (See AUTOMATIC DIRECTION FINDER.) (See COMPASS LOCATOR.)
Taxiways and apron (ramp) areas not under the control of air traffic.
(See NONPRECISION APPROACH PROCEDURE.)
NONPRECISION APPROACH PROCEDURE
A standard instrument approach procedure in which no electronic glideslope is provided; e.g., VOR, TACAN, NDB, LOC, ASR, LDA, or SDF approaches.
NONRADAR SEPARATION [ICAO]
The separation used when aircraft position information is derived from sources other than radar.
NORMAL OPERATING ZONE (NOZ)
The NOZ is the operating zone within which aircraft flight remains during normal independent simultaneous parallel ILS approaches.
NORTH AMERICAN ROUTE
A numerically coded route preplanned over existing airway and route systems to and from specific coastal fixes serving the North Atlantic. North American Routes consist of the following: a. Common Route/Portion. That segment of a North American Route between the inland navigation facility and the coastal fix. b. Noncommon Route/Portion. That segment of a North American Route between the inland navigation facility and a designated North American terminal. c. Inland Navigation Facility. A navigation aid on a North American Route at which the common route and/or the noncommon route begins or ends. d. Coastal Fix. A navigation aid or intersection where an aircraft transitions between the domestic route structure and the oceanic route structure.
NORTH AMERICAN ROUTE PROGRAM (NRP)
The NRP is a set of rules and procedures which are designed to increase the flexibility of user flight planning within published guidelines.
A beacon data block sent by the host computer to be displayed by the ARTS on a 360 degree bearing at a locally selected radar azimuth and distance. The North Mark is used to ensure correct range/azimuth orientation.
(See NOTICE TO AIRMEN.)
A NOTAM given (in addition to local dissemination) distant dissemination beyond the area of responsibility of the Flight Service Station. These NOTAMs will be stored and available until canceled.
NOTICES TO AIRMEN PUBLICATION
A publication issued every 28 days, designed primarily for the pilot, which contains current NOTAM information considered essential to the safety of flight as well as supplemental data to other aeronautical publications. The contraction NTAP is used in NOTAM text. (See NOTICE TO AIRMEN.)
(See NAVIGATION REFERENCE SYSTEM.)
(See NOTICES TO AIRMEN PUBLICATION.)
NUMEROUS TARGETS VICINITY (LOCATION)
A traffic advisory issued by ATC to advise pilots that targets on the radar scope are too numerous to issue individually. (See TRAFFIC ADVISORIES.)